package com.editev.chess;public class GameTree extends Chess {//extends Lists {    public final GameTree parent;    public final short        move;    long timeOfLastUse;    public long getTimeOfLastUse() { return timeOfLastUse;                       }    public void use()              { timeOfLastUse = System.currentTimeMillis(); }        GameHistory game;        public GameTree(                     ) { this( null, NO_MOVE );          }    public GameTree( GameTree parent, short move ) {         this.parent = parent;         this.move = move;         use();     }}